1. Line an 8×8 baking pan with parchment paper.
2. In a saucepan over low-medium heat, melt 2 tablespoons unsalted butter. 
3. Stir in 3 cups mini marshmallows, reserving the remaining ½ cup, until melted. 
4. To a large mixing bowl, add 3 cups of Lucky Charms cereal. 
5. Once your marshmallow mixture is melted and smooth, remove from the heat and pour into your mixing bowl with the cereal.
6. Add in the additional ½ cup reserved marshmallows and stir until the cereal is fully coated. 
7. Transfer the cereal mixture to your lined pan. The marshmallows will set fast. Use a greased spatula or grease your hand to help even out the mixture and avoid sticky hands. 
8. Let cool for at least 30 minutes. 
9. Cut into 6 large bars or 12 smaller bars. 

Optional Chocolate Coating:

1. Melt your white melting chocolate/wafers according to instructions. If using chocolate chips, add in a dash of heavy cream and heat it in the microwave in 15-30 second intervals stirring after each interval to avoid burning or seizing. 
2. If using sticks, dip the tip of your cake pop stick or popsicle stick into the melted chocolate and insert it halfway into the bar. 
3. Let dry for 2-3 minutes before fully dipping the bar or simply drizzle the white chocolate on top.